Irradiation apparatus



FIG. 1 is a front perspective view of an irradiation apparatus showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a top plan view thereof.

The broken lines in the Figures are portions of the irradiation apparatus that form no part of the claimed design. 

The ornamental design for an irradiation apparatus, as shown and described. 